GENERAL DESCRIPTION

The AD8218 is a high voltage, high resolution current shunt amplifier. It features a set gain of 20 V/V, with a maximum ±0.35 gain error over the entire temperature range. The buffered output voltage directly interfaces with any typical converter. The AD8218 offers excellent input common-mode rejection from 4 V to 80 V. The AD8218 performs bidirectional current measurements across a shunt resistor in a variety of industrial and telecom applications, including motor control, battery management, and base station power amplifier bias control.

FEATURES

High common-mode voltage range

4 V to 80 V operating

−0.3 V to +85 V survival

Buffered output voltage

Gain = 20 V/V

Wide operating temperature range: −40°C to +125°C

Excellent ac and dc performance

±100 nV/°C typical offset drift

±50 µV typical offset

±5 ppm/°C typical gain drift

110 dB typical CMRR at dc

APPLICATIONS

High-side current sensing

48 V telecom

Power management

Base stations

Bidirectional motor control

Precision high voltage current sources